We now know who blew the whistle on Visium Asset Management

Jacob Gottlieb, the founder of Visium. He has not been accused of wrongdoing.
Reuters/ Rick Wilking
The whistleblower behind the investigation into Visium Asset Management, the onetime $8 billion hedge fund that is shuttering amid fraud charges, has been revealed.

A former trader at the firm, Jason Thorell, approached the government, according to a Bloomberg News report out Monday morning.

He worked at Visium from 2011 to 2013, according to a LinkedIn page. He couldn't immediately be reached for comment.

"Thorell's approach to the government triggered an investigation into how Visium valued holdings in its credit portfolio, a probe that expanded into charges that executives were trading on inside tips about pending regulatory decisions about certain drugs. He is one of at least four people cooperating with a continuing U.S. investigation."

Thorell participated in the scheme to misvalue credit securities, according to court filings, which left him unnamed.

A broker who helped Visium in its alleged fraud by providing price quotes, David "Scott" Vandersnow, is also helping the government, according to Bloomberg. He couldn't immediately be reached for comment.